The GR9T800805CN Goodman gas furnace features high-quality construction and efficient operation at a great value. The GR9T800805CN two-stage, 9-speed furnace utilizes Goodman's superior heat exchanger design to provide efficient, reliable heating to your home. If you're looking to cut your energy bills and improve your comfort without breaking the bank, your search stops with the Goodman GR9T800805CN.
Features
This furnace is ideal to heat a medium-sized house (depending on climate)
80,000 BTU 80% efficient natural gas furnace
Requires metal flue venting
Can be used in the upflow or horizontal orientation
Can be converted to an LP furnace with a conversion kit (sold separately)
Innovative design for electrical efficiency, safety, and lower sound output
Specifications
Goodman 80% 80,000 BTU Two Stage Gas Furnace - 21" Width - Upflow / Horizontal
Reliable Two‑Stage Heating with Solid Efficiency The Goodman GR9T800805CN offers 80,000 BTU output at 80 % AFUE, converting most fuel into warmth while maintaining affordable operating costs—ideal for medium‑sized homes in moderate climates.
Two‑Stage Gas Valve for Comfort & Quiet Operation A two‑stage gas valve delivers soft, low‑fire heat during mild weather and full capacity when temperatures drop—resulting in smoother temperature control and less noise compared with single‑stage furnaces.
Multi‑Speed ECM Blower for Efficient Airflow The 9‑speed ECM blower motor provides efficient, customizable airflow and quiet circulation, improving comfort while lowering electrical use compared with traditional PSC motors.
Durable Ignition & Diagnostics Features a SureStart® silicon nitride hot surface igniter with long life and a self‑diagnostic control board that simplifies troubleshooting for HVAC professionals.
Flexible Upflow/Horizontal Design Multi‑position upflow and horizontal installation options enhance compatibility with various home layouts, while the removable bottom panel supports side‑ or bottom‑return configurations.
Heavy‑Gauge Cabinet & Quiet Performance Fully insulated, heavy‑gauge steel construction with baked‑enamel finish improves durability and reduces sound, and cabinet air‑leakage is kept low to boost efficiency.
Q&A
Q1: What type of furnace is this? A: This is an 80,000 BTU input, 80% AFUE gas furnace with a two‑stage gas valve and multi‑speed ECM blower, designed for reliable heating performance in residential HVAC systems.
Q2: What efficiency rating does it have? A: It delivers an 80% AFUE efficiency, meaning 80% of the fuel is converted into usable heat, with the rest vented out through a metal flue.
Q3: What installation orientations are supported? A: The furnace supports upflow and horizontal left/right installations, providing flexibility for attic, basement, or closet placements.
Q4: What blower and motor features does it include? A: It features a 9‑speed ECM blower motor, offering smoother airflow, quieter operation, and better comfort control across heating demands.
Q5: What are the electrical specifications? A: This unit operates on 115 V, single‑phase power and typically requires a breaker sized around 14–25 A, depending on setup.
Q6: What construction features does it offer? A: The furnace includes a heavy‑gauge steel cabinet, aluminized‑steel tubular heat exchanger, Silicon Nitride igniter, and self‑diagnostic control board for durability and reliability.
Q7: What are the physical dimensions? A: Cabinet size is approximately 33 3/8″ H × 21″ W × 28″ D, fitting standard residential furnace spaces.
Maintenance Tips
Replace Air Filters Every 1–3 Months – Clean filters maintain proper airflow, protect the blower, and prevent heat exchanger strain.
Inspect Burners & Heat Exchanger Annually – Check for soot, cracks, or corrosion to ensure safe combustion and maintain 80% AFUE efficiency. (hvacdirect.com)
Clean Condensate Drain & Pan – Keep the condensate system clear to prevent water buildup and microbial growth.
Check Electrical Components & Thermostat – Inspect wiring, limit switches, and two-stage thermostat operation to ensure reliable heating performance.
Maintain Proper Airflow – Keep supply and return vents unobstructed to prevent overheating and ensure efficiency.
Schedule Annual Professional Furnace Service – Technicians should inspect R32-compatible systems, clean internal components, verify two-stage operation, and ensure safe performance.
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